It used to be that an SD card could hold two gigabytes of data and was about the size of a postage stamp.

But the humble SD card can now hold much more. We are at the point where a micro-SD can hold as much as two terrabytes.

Techtalk regular George Fong says the newer cards do work a little differently.

"There is a new SD card out called SDXC. It struck us that a lot of people don't realise they're not just different types of SD cards but also different speeds and different qualities."

One of the catches is that older card readers don't work with the newest cards.

"If you get a new card reader they are backwards compatible with the old cards. If you get a new card they are not compatible with the old readers. You do need to be careful because you can destroy the data and the formatting if you use an old reader."

George also expressed his concerns about a governmental role in the running of the internet, something he says the UN is currently looking into.